The M-sequence encoding method for radar-communication system based on filter bank multi-carrier

As a burgeoning communication technology with flexible resource allocation, high spectral efficiency, strong anti-dual selective fading ability, filter-bank multi-carrier (FBMC) has a good prospect in the development of radar-communication integration. In this paper, we introduced FBMC technology to this integrated system and found many problems as follows (i) in order to transmit information by radar waveform, the integrated signal is loaded with the communication data. Since the data may be duplicated and similar, their correlation is big enough, which led to the radar resolution efficiency decline; (ii) when the data rate of communication increase, the number of FBMC symbols and subcarriers are increased as a consequence. The research shows it introduce a lower amplitude of the clutters of the distance ambiguity function, but the ambiguity area is widened. In order to improve the performance of distance resolution, this paper proposes a m-Sequence filter-bank multi-carrier (MS-FBMC) integrated radar-communication signal by preencoding of communication information based on m-Sequence to improve the radar-communication integration signal autocorrelation. The simulation results show that MS-FBMC signal's ambiguity function has an ideal thumbtack shape, and the distance distinguish capability of FBMC radar is also enhanced without decrease the transmission rate at the same time.